This year was supposed to be the "year of unicorns," but market volatility and the 35-day government shutdown have caused some companies looking to go public to slow down or delay their filing processes.

Some companies, including dueling ride-hailing competitors Uber and Lyft, have been taking their first official steps toward IPOs despite an uncertain economic environment.

Here are all the tech startups that have taken steps toward going public in 2019, as well as companies that are rumored to be gearing up for an IPO later this year.

Although the market for tech IPO offerings is being called a "s---show" in 2019, it hasn't stopped some startups from taking steps toward going public anyway.

Through the first two months of 2019, there have been only a handful of tech startups that have taken official steps toward going public. Some of the most highly anticipated startups have made their first moves already: Uber and Lyft are dueling it out to be the first of the two multibillion-dollar ride-hailing platforms to go public.

Here are the tech startups that have taken steps toward going public, and those that are rumored to make their first moves in 2019:

IPO status: Lyft confidentially filed paperwork with the Securities and Exchange Commission in December. Multiple news outlets have reported Lyft is readying to make its filing public as soon as the end of February, with a roadshow beginning the week of March 18.

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Jennifer Tejada, CEO of PagerDuty.
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Company role: IT incident-management platform

Year founded: 2009

Headquarters location: San Francisco

Valuation: $1.3 billion

Total funding raised: $173.7 million

Reported revenue: $100 million in "annual recurring revenue" as of September 2018 (Forbes)

IPO status: Slack announced in early February that it had confidentially filed to go public with the SEC. Slack is planning to go public through a direct listing rather than an IPO, following in the footsteps of Spotify, The Wall Street Journal reported. Its public debut is expected for the second quarter in 2019.

IPO status: Uber reportedly confidentially filed to go public in December. But in an interview with The Wall Street Journal in January, Uber CEO Dara Khosrowshahi said the company is in no rush to go public and will "do it when we're ready."

While the above companies have all taken steps toward filing to go public, there are other tech startups that are anticipated to soon follow. Here are some of the startups rumored to go public in 2019: